When my gpu(5750) starts a WU my core drops from 100% down to about 85-95% core load and the gpu stays @ 95% both are set to 100% but I think my system might be unstable? or is this normal with amd rigs?

When my gpu(5750) starts a WU my core drops from 100% down to about 85-95% core load and the gpu stays @ 95% both are set to 100% but I think my system might be unstable? or is this normal with amd rigs?

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The GPU WUs is a combination of GPU and CPU work. I noticed that the last 10-20 sec are pure CPU work. I doubt that that is different on an AMD system.